Vulnerability Report

CVE-2005-2531

Title: Openvpn Denial of Service (DoS)

DoS

Proof Of Concept

No public PoC currently indexed for CVE-2005-2531.

CWE Category NVD-CWE-noinfo
Published Date Aug 24, 2005
Modified Date Jun 16, 2026
Exploit Status Not Found
Score 5.0 CVSS v2.0
Exploit Probability (EPSS)
1.97%

Vulnerability Summary

CVE-2005-2531: OpenVPN before 2.0.1, when running with "verb 0" and without TLS authentication, does not properly flush the OpenSSL error queue when a client fails certificate authentication to the server and causes the error to be processed by the wrong client, which allows remote attackers to cause a denial of service (client disconnection) via a large number of failed authentication attempts.

Impacted Vendors

O
openvpn 1
A
aviatrix 1

Reference Links

http://openvpn.net/changelog.html http://secunia.com/advisories/16463 http://secunia.com/advisories/17103 http://www.debian.org/security/2005/dsa-851 http://www.mandriva.com/security/advisories?name=MDKSA-2005:145 http://www.novell.com/linux/security/advisories/2005_20_sr.html http://www.securityfocus.com/bid/14605 http://openvpn.net/changelog.html http://secunia.com/advisories/16463 http://secunia.com/advisories/17103 http://www.debian.org/security/2005/dsa-851 http://www.mandriva.com/security/advisories?name=MDKSA-2005:145 http://www.novell.com/linux/security/advisories/2005_20_sr.html http://www.securityfocus.com/bid/14605
CVSS v2.0
Source Entity [email protected]
Severity MEDIUM
5.0
Access Vector
N/A
Authentication
N/A
RAW VECTOR AV:N/AC:L/Au:N/C:N/I:N/A:P

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2005-2531 Exploits & PoCs (Proof Of Concept)

No public PoCs found in our database for this CVE.

MODIFIED

Vulnerability data updated via NVD.

MODIFIED

Vulnerability data or affected products updated.

PUBLISHED

Vulnerability first announced in NVD.

Attack Vector Matrix

Access Vector N/A
Complexity N/A
Privileges N/A
Interaction NONE
CVSS Vector String AV:N/AC:L/Au:N/C:N/I:N/A:P

Affected Stack

No specific products linked.